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Modbus Agile 73 02/2011
Control / Reference Value
10.3 Behavior in Quick Stop
In this case, the parameters
Switch-Off Threshold Stop Function
637 (percentage of parameter
Max-
imum Frequency
419) and
Holding Time Stop Function
638 (holding time after the value drops be-
low the switch-off limit) are relevant.
In a quick stop, the drive is brought to a standstill via the emergency stop ramps (
Emergency Stop
Clockwise
424 or
Emergency Stop Anticlockwise
425).
f
s
Start Quick Stop
OFF
change of state
t
Switch-off Threshold Stop Fct.
637
Emergency Stop Clockwise
424
425
Emergency Stop Anticlockwise
Holdig Time Stop Function
638
If the frequency/speed reaches the value zero during the switch-off time, the drive continues to be
supplied with current until the switch-off time has elapsed. This ensures that the drive is at a standstill
when the state changes.
10.4 Behavior in State-Transition 5

392 state-transition 5
The behavior in transition 5 (from "Operation enabled" to "Switched On") can be set via Parameter
state-tr
ansition 5
392.
Transition
5 392 Function
0 - Coast to Stop
Immediate transition from "Operation released" to "Switched On", drive
coasts to a standstill.
1 - DC-Brake
Activation of DC brake, at the end of DC deceleration, there is the change
from "Operation released" to "Switched On".
2 - Ramp
Transition at normal ramp, when the drive has come to a standstill, there
is the change from "Operation released" to "Switched On".
Setting 1 "DC-Brake" is only possible with applications with sensor-less control (e.g. configuration
110). Other configurations do not support this operation mode.
If the frequency inverter is operated with a configuration which does not support the operation mode
DC-Brake (e.g. configuration 210, field-oriented control), value "1" cannot be used. In this case, the
operation mode is not offered in the selection menus of the Operator Panel or the VPlus PC-Software.
The default value for
state-transition 5
392 is operation mode 2 (ramp). For configurations with tor-
que control, the default value is 0 (coasting).
If the configuration is changed, the value set for
state-transition 5
392 is also changed, if necessary.
If
state-transition 5
392 was triggered with value 1 "Direct current brake", a new Control Word will
only be accepted after the transition process is complete. The change of state from "Operation re-
leased" to "Switched On" is carried out after the
Braking Time
632 parameterized for the DC brake
has elapsed.
If parameter
state-transition 5
392 = 2 "ramp" is set, the Control Word can be set to 0x0F again,
while the drive is decelerating. In this way, the drive accelerates to its set reference value again and
remains in the state "Operation released".
The change of state from "Operation enabled" to "Switched On" is done after the value has dropped
below the set switch-off threshold and the set holding time has elapsed (equivalent to the behavior in
the case of a quick stop). In this case, the parameters
Switch-Off Threshold Stop Function
637 (per-
centage of parameter
Maximum Frequency
419) and
Holding Time Stop Function
638 (holding time
after the value drops below the switch-off limit) are relevant.
11 Actual Values
Actual Values
No. Description Function
11 VABus SST-Error-Register
Modbus or VABus Error Register.
See Chapter 7.3.9 "Exception Codes".
282 Reference Bus Frequency Reference value from the serial interface.
283 Reference Ramp Frequency Reference value from the Reference Frequency Channel.
411 Status Word
Modbus or VABus Status Word.
See Chapter 10 "Control / Reference Value"